Above Normal Temperatures, Strong Thunderstorms, Tropical Development Being Monitored

Well above normal temperatures are forecast to shift from the northern Plains through the Northeast U.S. over the long holiday weekend. A few strong to severe thunderstorm will be possible as well along with a potential for excessive rainfall. A tropical or subtropical depression could form off the Southeast U.S. coast over the weekend while drifting northward to northeastward. Read More >

CHICAGO NORMALS (1991-2020)
JAN	FEB	MAR	APR	MAY	JUN	JUL	AUG	SEP	OCT	NOV	DEC

December Normals for Chicago for Temperature, Precipitation and Snowfall

Day of Month	High	Low	Average	HDD	CDD	Precipitation	Snowfall
1	41.3	28.4	34.8	30.2	0	0.08	0.2
2	40.9	28.1	34.5	30.5	0	0.08	0.2
3	40.5	27.7	34.1	30.9	0	0.07	0.2
4	40.1	27.4	33.8	31.2	0	0.08	0.2
5	39.8	27.1	33.4	31.5	0	0.08	0.3
6	39.4	26.8	33.1	31.9	0	0.07	0.2
7	39	26.6	32.8	32.2	0	0.08	0.2
8	38.7	26.3	32.5	32.5	0	0.07	0.2
9	38.4	26	32.2	32.8	0	0.08	0.2
10	38	25.7	31.9	33.1	0	0.07	0.3
11	37.7	25.5	31.6	33.4	0	0.07	0.2
12	37.4	25.2	31.3	33.7	0	0.06	0.2
13	37.1	25	31	33.9	0	0.07	0.3
14	36.8	24.7	30.8	34.2	0	0.07	0.2
15	36.6	24.5	30.5	34.5	0	0.06	0.2
16	36.3	24.2	30.3	34.7	0	0.06	0.3
17	36	24	30	35	0	0.07	0.2
18	35.8	23.8	29.8	35.2	0	0.06	0.3
19	35.5	23.6	29.5	35.5	0	0.07	0.2
20	35.3	23.3	29.3	35.7	0	0.06	0.2
21	35	23.1	29.1	35.9	0	0.06	0.3
22	34.8	22.9	28.8	36.1	0	0.07	0.3
23	34.6	22.7	28.6	36.4	0	0.06	0.2
24	34.4	22.5	28.4	36.6	0	0.07	0.3
25	34.2	22.2	28.2	36.8	0	0.06	0.3
26	34	22	28	37	0	0.06	0.2
27	33.8	21.8	27.8	37.2	0	0.06	0.3
28	33.6	21.6	27.6	37.4	0	0.07	0.3
29	33.4	21.4	27.4	37.6	0	0.06	0.3
30	33.2	21.2	27.2	37.8	0	0.06	0.3
31	33	21	27	38	0	0.07	0.3

MONTH	36.6	24.4	30.5	1069.4	0	2.11	7.6

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Above Normal Temperatures, Strong Thunderstorms, Tropical Development Being Monitored

December Normals for Temperature, Precipitation and Snowfall for Chicago, IL